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package org.eclipse.swt.custom;
/*
* Copyright (c) 2000, 2002 IBM Corp. All rights reserved.
* This file is made available under the terms of the Common Public License v1.0
* which accompanies this distribution, and is available at
* http://www.eclipse.org/legal/cpl-v10.html
*/
import org.eclipse.swt.events.*;
/**
* This event is sent to BidiSegmentListeners when a line is to
* be measured or rendered in a bidi locale. The segments field is
* used to specify text ranges in the line that should be treated as
* separate segments for bidi reordering. Each segment will be reordered
* and rendered separately.
* <p>
* The elements in the segments field specify the start offset of
* a segment relative to the start of the line. They must follow
* the following rules:
* <ul>
* <li>first element must be 0
* <li>elements must be in ascending order and must not have duplicates
* <li>elements must not exceed the line length
* </ul>
* In addition, the last element may be set to the end of the line
* but this is not required.
*
* The segments field may be left null if the entire line should
* be reordered as is.
* </p>
* A BidiSegmentListener may be used when adjacent segments of
* right-to-left text should not be reordered relative to each other.
* For example, within a Java editor, you may wish multiple
* right-to-left string literals to be reordered differently than the
* bidi algorithm specifies.
*
* Example:
* <pre>
* stored line = "R1R2R3" + "R4R5R6"
* R1 to R6 are right-to-left characters. The quotation marks
* are part of the line text. The line is 13 characters long.
*
* segments = null:
* entire line will be reordered and thus the two R2L segments
* swapped (as per the bidi algorithm).
* visual line (rendered on screen) = "R6R5R4" + "R3R2R1"
*
* segments = [0, 5, 8]
* "R1R2R3" will be reordered, followed by [blank]+[blank] and
* "R4R5R6".
* visual line = "R3R2R1" + "R6R5R4"
* </pre>
*/
public class BidiSegmentEvent extends TypedEvent {
/** line start offset */
public int lineOffset;
/** line text */
public String lineText;
/** bidi segments, see above */
public int[] segments;
BidiSegmentEvent(StyledTextEvent e) {
super(e);
lineOffset = e.detail;
lineText = e.text;
}
}
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